11 ORA-8102：Index Corruption解析
[oracle@DSI ~]$ oerr ora 8102
08102, 00000, “index key not found, obj# %s, file %s, block %s (%s)”
// *Cause: Internal error: possible inconsistency in index
// *Action: Send trace file to your customer support representative, along
// with information on reproducing the error
常见于索引键值与表上存的值不一致，可能是ORACLE的bug，也可能是由于硬件I/O错误所引起！
硬件或者I/O子系统由于丢失写 Lost Write造成块的逻辑上讹误，当一个Lost Io发生，包含对key的修改或者没有写入到ORACLE数据文件上，
这即可能发生在表块上也可能发生在索引块上。
ORA-8102：Index Corruption解析（Cont…）
创建索引–>更新数据块–>1号文件52号块–>con$
–>更新索引块–>1号文件xxx块–>con$
–二者不相等就会报错8102
–人为构建8102错误
SQL> conn test/***
Connected.
SQL> create table yhq_test(id int,name varchar2(100));Table created.SQL> begin
for i in 1 .. 5000 loop
insert into yhq_test values(i,'yhq'||i);
commit;
end loop;
end;
/ 2 3 4 5 6 7 PL/SQL procedure successfully completed.SQL> select user_id,username from dba_users where username='TEST'; USER_ID USERNAME
---------- ------------------------------
83 TESTSQL> alter table yhq_test add primary key(id);Table altered.SQL> select CONSTRAINT_NAME from dba_constraints where table_name='YHQ_TEST';CONSTRAINT_NAME
------------------------------
SYS_C0011762
–查看索引文件块号
SQL> conn / as sysdba
Connected.
SQL> select dbms_rowid.rowid_relative_fno(rowid) file#,dbms_rowid.rowid_block_number(rowid) block#,
dbms_rowid.rowid_row_number(rowid) row#
from con$
where name='_NEXT_CONSTRAINT'; 2 3 4 FILE# BLOCK# ROW#
---------- ---------- ----------
1 289 12
SQL> select /*+ FULL(t1) */ owner#,name,con# from con$ t1 WHERE NAME='_NEXT_CONSTRAINT'; OWNER# NAME CON#
---------- ------------------------------ ----------
0 _NEXT_CONSTRAINT 11763SQL> select /*+ index(t1 I_CON2) */ owner#,name,con# from con$ t1 WHERE NAME='_NEXT_CONSTRAINT'; OWNER# NAME CON#
---------- ------------------------------ ----------
0 _NEXT_CONSTRAINT 11763
--这两个值相等是正常的
SQL> select * from bootstrap$ where obj#=52; LINE# OBJ#
---------- ----------
SQL_TEXT
--------------------------------------------------------------------------------
52 52
CREATE UNIQUE INDEX I_CON2 ON CON$(CON#) PCTFREE 10 INITRANS 2 MAXTRANS 255 STOR
AGE ( INITIAL 64K NEXT 1024K MINEXTENTS 1 MAXEXTENTS 2147483645 PCTINCREASE 0 O
BJNO 52 EXTENTS (FILE 1 BLOCK 464))
–用bbed查看并修改
BBED> set file 1 block 289
FILE# 1
BLOCK# 289
BBED> map /v
File: /u01/app/oracle/oradata/orcl/system01.dbf (1)
Block: 289 Dba:0x00400121BBED> p *kdbr[]
rowdata[]
----------
ub1 rowdata[] @920 0x2cBBED> x /rccnn
rowdata[] @920
----------
flag@920: 0x2c (KDRHFL, KDRHFF, KDRHFH)
lock@921: 0x01
cols@922: 4col 0[] @923: .
col 1[] @925: _NEXT_CONSTRAINT
col 2[] @942: 11763 ##这个11763和上面查到的一致
col 3[] @947: 0
–11763 修改为11764
--十进制转换
SQL> select dump(11763,16) from dual;DUMP(11763,16)
-----------------------
Typ=2 Len=4: c3,2,12,40SQL> select dump(11764,16) from dual;DUMP(11764,16)
-----------------------
Typ=2 Len=4: c3,2,12,41
SQL> alter system flush buffer_cache;
System altered.
–修改并查看
BBED> d /v offset 942 count 32
File: /u01/app/oracle/oradata/orcl/system01.dbf (1)
Block: 289 Offsets: 942 to 973 Dba:0x00400121
-------------------------------------------------------
04c30212 4001802c 00040180 105f4e45 l .n.@..,....._NE
58545f43 4f4e5354 5241494e 5403c302 l XT_CONSTRAINT.n <16 bytes per line>
BBED> modify /x 41 offset 946
Warning: contents of previous BIFILE will be lost. Proceed? (Y/N) y
File: /u01/app/oracle/oradata/orcl/system01.dbf (1)
Block: 289 Offsets: 946 to 977 Dba:0x00400121
------------------------------------------------------------------------
4101802c 00040180 105f4e45 58545f43 4f4e5354 5241494e 5403c302 1201802c <32 bytes per line>BBED> sum apply
Check value for File 1, Block 289:
current = 0xf014, required = 0xf014BBED> d /v offset 942 count 32
File: /u01/app/oracle/oradata/orcl/system01.dbf (1)
Block: 289 Offsets: 942 to 973 Dba:0x00400121
-------------------------------------------------------
04c30212 4101802c 00040180 105f4e45 l .n.A..,....._NE
58545f43 4f4e5354 5241494e 5403c302 l XT_CONSTRAINT.n <16 bytes per line>
BBED> p *kdbr[]
rowdata[]
----------
ub1 rowdata[] @920 0x2cBBED> x /rccnn
rowdata[] @920
----------
flag@920: 0x2c (KDRHFL, KDRHFF, KDRHFH)
lock@921: 0x01
cols@922: 4col 0[] @923: .
col 1[] @925: _NEXT_CONSTRAINT
col 2[] @942: 11764 ###修改为11763+1
col 3[] @947: 0
–重启数据库，查看，并重建索引
--重启数据库
SQL> startup;
ORACLE instance started.Total System Global Area 784998400 bytes
Fixed Size 2257352 bytes
Variable Size 478154296 bytes
Database Buffers 297795584 bytes
Redo Buffers 6791168 bytes
Database mounted.
Database opened.
SQL>
SQL>
SQL> select /*+ FULL(t1) */ owner#,name,con# from con$ t1 WHERE NAME='_NEXT_CONSTRAINT'; OWNER# NAME CON#
---------- ------------------------------ ----------
0 _NEXT_CONSTRAINT 11764SQL> select /*+ index(t1 I_CON2) */ owner#,name,con# from con$ t1 WHERE NAME='_NEXT_CONSTRAINT'; OWNER# NAME CON#
---------- ------------------------------ ----------
0 _NEXT_CONSTRAINT 11763
--两个值不一样
SQL> conn test/test
Connected.
SQL> alter table yhq_test drop primary key;Table altered.SQL> alter table yhq_test add primary key(id);
alter table yhq_test add primary key(id)
*
ERROR at line 1:
ORA-00604: error occurred at recursive SQL level 1
ORA-08102: index key not found, obj# 52, file 1, block 78302 (2)
–查看错误日志
[oracle@DSI ~]$ tail -n 30 /u01/app/oracle/diag/rdbms/orcl/orcl/trace/orcl_ora_14127.trc
REDO RECORD - Thread:1 RBA: 0x000026.00004836.0010 LEN: 0x0074 VLD: 0x05
SCN: 0x0000.009c8d44 SUBSCN: 1 07/10/2019 09:52:46
(LWN RBA: 0x000026.00004836.0010 LEN: 0003 NST: 0001 SCN: 0x0000.009c8d44)
CHANGE #1 MEDIA RECOVERY MARKER SCN:0x0000.00000000 SEQ:0 OP:18.3 ENC:0
Reuse redo entry
Object reuse: tsn=5 objd=88123REDO RECORD - Thread:1 RBA: 0x000026.00004839.018c LEN: 0x0048 VLD: 0x01
SCN: 0x0000.009c8d47 SUBSCN: 3 07/10/2019 09:52:46
(LWN RBA: 0x000026.00004839.0010 LEN: 0001 NST: 0001 SCN: 0x0000.009c8d47)
CHANGE #1 MEDIA RECOVERY MARKER SCN:0x0000.00000000 SEQ:0 OP:18.3 ENC:0
Reuse redo entry
Range reuse: tsn=5 base=20984144 nblks=8
END OF DUMP REDO
KQRCMT: Write failed with error=604 po=0x885dde30 cid=12
diagnostics : cid=12 hash=28d84319 flag=2a
[oracle@DSI ~]$ tail -n 30 /u01/app/oracle/diag/rdbms/orcl/orcl/trace/alert_orcl.log
–dump索引块–存放索引信息
SQL> alter system dump datafile 1 block 78302;
System altered.
[oracle@DSI ~]$ vim /u01/app/oracle/diag/rdbms/orcl/orcl/trace/orcl_ora_14148.trcBlock header dump: 0x004131de
Object id on Block? Y
seg/obj: 0x34 csc: 0x00.9c8d42 itc: 3 flg: O typ: 2 - INDEX
fsl: 0 fnx: 0x4131df ver: 0x01
Itl Xid Uba Flag Lck Scn/Fsc
0x01 0x0006.002.00005b68 0x00c07d95.01df.01 CB-- 0 scn 0x0000.0096102a
0x02 0x0009.018.00005c53 0x00c00102.01f8.11 C--- 0 scn 0x0000.009c713e
0x03 0x0008.003.00007a05 0x00c01bfd.0225.01 --U- 1 fsc 0x000f.009c8d43
Leaf block dump
===============
header address 139990239005300=0x7f520477ca74
kdxcolev 0
KDXCOLEV Flags = - - -
kdxcolok 0
kdxcoopc 0x80: opcode=0: iot flags=--- is converted=Y
kdxconco 1
kdxcosdc 1
kdxconro 359
kdxcofbo 754=0x2f2
kdxcofeo 1942=0x796
kdxcoavs 2591
kdxlespl 0
kdxlende 1
kdxlenxt 0=0x0
kdxleprv 4272605=0x4131dd
kdxledsz 6
kdxlebksz 8008row#357[] flag: ---D--, lock: 3, len=13, data:(6): 00 41 57 47 00 61
col 0; len 4; (4): c3 02 12 3f
row#[] flag: ------, lock: 0, len=13, data:(6): 00 40 01 21 00 0c ---1955 相对位置
col ; len ; (): c3
----- end of leaf block dump -----
End dump data blocks tsn: 0 file#: 1 minblk 78302 maxblk 78302
–使用bbed查看并修改
BBED> set file 1 block 78302;
FILE# 1
BLOCK# 78302
BBED> p ktbbhSQL> select utl_raw.cast_to_number(replace('c3 02 12 40',' ')) from dual; --转成成十进制UTL_RAW.CAST_TO_NUMBER(REPLACE('C3021240',''))
----------------------------------------------
11763BBED> d /v offset 1955 count 32 ------注意1955的来源
File: /u01/app/oracle/oradata/orcl/system01.dbf (1)
Block: 78302 Offsets: 1955 to 1986 Dba:0x004131de
-------------------------------------------------------
00000041 574600e8 04c30211 19010000 l ...AWF.毃......
40012100 0c04c302 111a0000 00415746 l @.!...n.....AWF <16 bytes per line>SQL> select 1955+20+24+24*3+8 from dual; --索引加1241955+20+24+24*3+8
-----------------
2079BBED> d /v offset 2079 count 32
File: /u01/app/oracle/oradata/orcl/system01.dbf (1)
Block: 78302 Offsets: 2079 to 2110 Dba:0x004131de
-------------------------------------------------------
04c30212 40000000 41574700 6004c302 l .n.@...AWG.`.n
123e0100 00400121 000c04c3 02123f00 l .>...@.!...n.?. <16 bytes per line>
BBED> modify /x 41 offset 2083
Warning: contents of previous BIFILE will be lost. Proceed? (Y/N) y
File: /u01/app/oracle/oradata/orcl/system01.dbf (1)
Block: 78302 Offsets: 2083 to 2114 Dba:0x004131de
------------------------------------------------------------------------
41000000 41574700 6004c302 123e0100 00400121 000c04c3 02123f00 00004157 <32 bytes per line>BBED> sum apply
Check value for File 1, Block 78302:
current = 0x35c8, required = 0x35c8
–重启db，并重建索引
-重启
SQL> shutdown immediate
Database closed.
Database dismounted.
ORACLE instance shut down.
SQL> startup
ORACLE instance started.Total System Global Area 784998400 bytes
Fixed Size 2257352 bytes
Variable Size 478154296 bytes
Database Buffers 297795584 bytes
Redo Buffers 6791168 bytes
Database mounted.
Database opened.
--修改为2个值一样
SQL> select /*+ FULL(t1) */ owner#,name,con# from con$ t1 WHERE NAME='_NEXT_CONSTRAINT'; OWNER# NAME CON#
---------- ------------------------------ ----------
0 _NEXT_CONSTRAINT 11764SQL> select /*+ index(t1 I_CON2) */ owner#,name,con# from con$ t1 WHERE NAME='_NEXT_CONSTRAINT'; OWNER# NAME CON#
---------- ------------------------------ ----------
0 _NEXT_CONSTRAINT 11764SQL> conn test/***
Connected.
SQL> alter table yhq_test add primary key(id);Table altered.SQL> select CONSTRAINT_NAME from dba_constraints where table_name='YHQ_TEST';CONSTRAINT_NAME
------------------------------
SYS_C0011764
—正常。
